13.3.3.3. Consider the following statements for motor connection:
2 serial contactors must be used at motor circuit for conformity to EN-81.
The drive enable signal (EN) must be switched by the open contacts of KPA and KPB.
Otherwise the inverter will continue driving the motor after the contactors are off.
Meanwhile If the contactors are on again the outputs of the inverter may be damaged
because of over current.
For synchronous drive, 2 main contactors with 4 main contacts each has 2x NO and 2x
NC main contacts are required for motor connection. The motor windings must be short
circuited with NC main contact of each main contactor to prevent an uncontrolled
acceleration of the synchronous motor (See wiring diagram). Due to the high current,
main contacts MUST be used for short circuiting.
For synchronous drive, the drive enable signal (EN) must also be switched by a NO
contact of an auxiliary relay. The auxiliary relay has to be connected parallel to the
travel contactors. (See chapter 13.2.1.1)
The length of the motor wire should not be longer than 10 meters. If the motor wire need
to be longer than 10 meters, a motor output reactor is recommended.
Use a shielded cable with an appropriate cross-section (For more information see
Chapter 6)
Motor cable must both be grounded both the inverter and the motor.
Motor cable must be pulled away from the other cables as far as possible.
The placement of the motor cables must not be parallel to other cables. If necessary, the
angle between the motor cable and other cables must be 90 degree.
Cables must have at least +60 ºC temperature resistance.
For a suitable ground connection, the shield of motor cable should be fixed to ground
plate with metal clamps.
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